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True or false: A critical value is considered part of the rejection region. In problem pertain to the critical-value approach to hypothesis testing. Use this data set: 8, 9, 5, 4, 7, and 8. Find the following: X Use this data set: 8, 9, 5, 4, 7, and 8. Find the following: X 2 = Use this data set: 8, 9, 5, 4, 7, and 8. Find the following: X 1 Do different generations view marriage differently? A 2010 survey conducted by the Pew Research Center asked the following question of each participant: Is marriage becoming obsolete? Results of this... Based on this study, is it reasonable to conclude that by sending TVs to countries with lower life expectancies, we can increase their inhabitants lifetimes? If yes, explain how. If no, give an... In a January 2014 Quinnipiac University poll the following question was asked to a random sample of U.S. voters: Do you support or oppose the health care law passed by Barack Obama and Congress in... Refer to the previous exercise about the study of the relationship between level of physical activity and aging. Show how to calculate the chi-square statistic by setting up the formula with... What are the SAT subset scores associated with the extreme 8% of scores? Werners score on an SAT subtest was 480. What is his score as a percentile rank? The average American male is 5 9. The standard deviation for height is 3. If a basketball coach only wants to have American men on his team who are at least 6 6, what percentage of the U.S. male... What percentage of cases in a normal distribution fall at or above a z score of 0.85? The data in the fi le GestationLifeExpectancy gives the gestation period (in days) and the life expectancy (in years) for a sample of mammals. We will consider this sample to be representative of all... Two Cal Poly freshmen gathered data on a random sample of textbooks from the campus bookstore in November of 2006. Two of the variables recorded were the price of the book and the number of pages... Reconsider the previous exercise on prices of Honda Civics. a. Find the regression equation that predicts the price of the car given its age. b. Interpret the slope and intercept of the regression... The data file RollerCoasters contains data (collected from www.rcdb.com) on the maximum speed (miles per hour) and the maximum height (feet) for each of a sample of roller coasters in the U.S. Enter... The procedure by which the observation of a ____ is used to evaluate a hypothesis about a ____ is called ____. If one fails to disprove the null hypothesis, one cant say it has been ____. A group of statistics students wanted to investigate the effect of social media on a persons self-esteem. For this purpose, they conducted a study where participants were randomly assigned to one of... Statistics students were surveyed and two of the questions they were asked was what type of cellphone they use (Basic, iPhone, Smart Phone that is not an iPhone) and how much sleep they typically get... The 95% confidence interval for the difference between population means tells how far apart or how close the two ____ means might be. To calculate the degrees of freedom for an independent-samples t test, subtract ____ from N. Consider the hospital emergency room data given below. Let A denote the event that a visit is to hospital 4, and let B denote the event that a visit results in LWBS (at any hospital). Use the... A demographer working for the U.S. Census Bureau wants to compare salaries for urban vs. rural areas. She gets a sample of psychologists who live in urban areas and a sample of psychologists who live... A medical educator is using an independent samples t test to compare the age of physicians who complete the minimum number of continuing education hours per year versus those who complete extra hours... Table 6E.5 contains the global mean surface air temperature anomaly and the global CO 2 concentration for the years 18802004. The temperature is measured at a number of locations around the world and... If t cv = 2.396, write the decision rule for a one-tailed test for (a) when to reject the null hypothesis and (b) when to fail to reject the null hypothesis. Table 6E.6 presents data on the ratings of quarterbacks for the 2008 National Football League season (source: The Sports Network). It is suspected that the rating (y) is related to the average number... In the book Bayesian Inference in Statistical Analysis (1973, John Wiley and Sons) by Box and Tiao, the total product yield for five samples was determined randomly selected from each of six randomly... The null hypothesis states that there is ____ mean difference between any of the populations. For a between-subjects, one-way ANOVA, the cases in each group should be ____ from the population. An article in Quality Engineering [Designed Experiment to Stabilize Blood Glucose Levels (19992000,)] described an experiment to minimize variations in blood glucose levels. The treatment was the... The risk of making a Type I error ____ as the number of statistical tests being completed increases. ____, one-way ANOVA compares the means of three or more independent samples. If = .05, N = 80, and k = 5, what is F cv ? If df Between = 3 and df Within = 36, what is F cv if = .05 If N = 120 and k = 5, calculate (a) df Total , (b) df Between , and (c) df Within . If M 1 = 12.55, M 2 = 13.74, M 3 = 5.49, and HSD = 4.44, which pairs of means have statistically significant differences? What is the direction of the differences? If df Between = 6, df Within = 30, F = 2.81, and = .05, write the results in APA format. (Use df Between and df Within to find F cv in order to determine if the null hypothesis was rejected.) Repeated-measures ANOVA is used to compare the ____ of ____ or more dependent samples. The random samples assumption says that the samples in a repeated-measures ANOVA are ____ samples from the population to which one wishes to generalize the results. The null hypothesis is not rejected if F is ____ the critical value of F. Values of F cv depend on the numerator and denominator ____. One-way, repeated-measures ANOVA divides df Total into subcomponents for two different sources of ____. If F falls on the line that separates the rare zone from the common zone, the null hypothesis is / is not rejected. The only mean squares one needs to calculate for a one-way, repeated-measures ANOVA are MS ____ and MS ____. The first question to be addressed in an interpretation of a one-way, repeated-measures ANOVA is ____. Results were reported in APA format as F(2, 22) = 0.89, p > .01. The alpha level was ____. Eta squared provides information about the size of the ____. Reproduce the given computer-generated direction fie­ld. Then sketch, by hand, an approximate solution curve that passes through each of the indicated points. Use different colored pencils for... Eta squared tells the percentage of variability in the ____ variable that is explained by the ____ variable. If k = 5, n = 20, and N = 100, what are df Subjects , df Treatment , df Residual , and df Total ? If a difference in a post-hoc test is statistically significant, the two sample means can be used to determine the ____ of the difference for the two population means. To calculate an HSD value, one needs to find a ____ value in Appendix Table 5. The ____ is a post-hoc test for use with oneway, repeated-measures ANOVA. The closer eta squared is to ____%, the bigger the effect. If the null hypothesis is rejected for the rows effect and for the interaction effect, but not for the columns effect, which effects should be interpreted? If the null hypothesis is rejected for the rows effect and the columns effect, but not for the interaction effect, which effects should be interpreted? If SS Interaction = 0.60 and df Interaction = 4, calculate MS Interaction . If R = 2, C = 3, and n = 11, calculate the degrees of freedom for the following effects: (a) Rows, (b) Columns, (c) Interaction, (d) Within groups, (e) Between groups, and (f) Total. A hypothesis will be used to test that a population mean equals 7 against the alternative that the population mean does not equal 7 with known variance . What are the critical values for the test... A 95% confidence interval for ranges from .61 to .70. a. Was the null hypothesis rejected? b. Were the results statistically significant? c. Could the relationship between X and Y in the population... If a 95% confidence interval for in z r units ranges from 1.52 to 0.26, what is it in r units? Transforming r to z r . If r = .33, what is z r ? If r = .05, (a) Calculate r squared and (b) Classify the effect as small, medium, or large. If r(30) = .40, p < .05, (a) What conclusion can be drawn about the existence of a relationship between X and Y in the population? (b) Comment on the direction of the relationship in the population. If r cv = +.554, what is the decision rule? Given a one-tailed test, = .05, N =33, and H 1 : < 0, what is r cv ? If the confidence interval is wide, one is likely to recommend ____ of the study with a larger ____. When transforming a confidence interval from z r units to r units, make sure to maintain the ____ of the z r units. Cohen considers an r 2 of ____% or greater to be a large effect. As r 2 gets closer to ____%, the effect is considered stronger. If a result is not statistically significant, then there is a possibility of a ____ error. If the relationship between X and Y is a direct one, then cases with high scores on X are likely to have ____ scores on Y. If APA format says r(8) = .23, p > .05, then the results were ____ significant. APA says a correlation should be reported as ____, not 0.45. Finding r cv depends on the number of tails in the test, alpha, and ____. If the hypotheses are nondirectional, then one is completing a ____-tailed test. If the alternative hypothesis is < 0, then the researcher believes the relationship between X and Y is direct / inverse. The alternative hypothesis for a two-tailed test says there is ____ relationship in the population between X and Y, but it doesnt state the ____ of the relationship. The null and alternative hypotheses are statements about the ____ value of the correlation. The linearity assumption is tested by making a ____. A deflated value of a correlation can be caused by a ____. An outlier can ____ the value of a correlation. X and Y have an inverse relationship. As scores on X go up, scores on Y go ____. An r of ____ or ____ indicates a perfect linear relationship. If there is no linear relationship, then r = ____. By the definitional formula for Pearson r, r is the ____ of multiplied-together pairs of ____. Making a scatterplot using z scores instead of raw scores does / does not change the shape of the scatterplot. The predictor variable in a correlation is the one that is viewed as ____ the other variable. If there is a cause-and-effect relationship between two variables, then they are ____. But, if two variables are correlated, there is not necessarily a ____ relationship between them. The World Health Organization defines obesity in adults as having a body mass index (BMI) higher than 30. Of the 250 men in the study mentioned in Exercise 11-1, 23 are by this definition obese. How... Statisticians love to say that correlation ____ causation. A Pearson r measures how much the points in a scatterplot fall in a ____ line. If theres a relationship between two variables, they are said to be ____. A Pearson r measures the degree of ____ relationship between two ____ variables. You have fit a multiple linear regression model and the (X'X) 1 matrix is: (a) How many regressor variables are in this model? (b) If the error sum of squares is 307 and there are 15 observations,... Table E12-3 provides the highway gasoline mileage test results for 2005 model year vehicles from DaimlerChrysler. The full table of data (available on the books Web site) contains the same data for... An article in Electronic Packaging and Production (2002, Vol. 42) considered the effect of X-ray inspection of integrated circuits. The rads (radiation dose) were studied as a function of current (in... An article in Cancer Epidemiology, Biomarkers and Prevention (1996, Vol. 5, pp. 849852) reported on a pilot study to assess the use of toenail arsenic concentrations as an indicator of ingestion of...
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